I can't speak for Mozilla at large, but I've had the pleasure of witnessing both Mozilla's Rust and Servo teams at work and can assure you that they are at the top of their league. To pick just two examples, Alex Crichton is an unstoppable machine ricocheting around the compiler, standard libraries, package manager, various miscellaneous tooling, and dozens of libraries in the broader Rust ecosystem leaving patches in his wake (all while finding time to perform legendarily detailed code reviews); meanwhile, Patrick Walton is an awe-inspiring graphics programmer and browser engineer whom I am convinced is among the top five humans with back-to-front understandings of the CSS specification, and by now is likely the world's foremost expert on cross-browser CSS quirks and edge cases.

TL;DR: I'm a squeeing fanboy for a lot of the people in Mozilla Research.

Both Go and Jeff Dean's projects are meant for server-side work, so it is unsurprising that Mozilla is not a rival in this space.

However, it turns out they are heavily innovating in the same space as Go with their stunning work on Rust. Additionally, they are building world-class next-gen products with their work on Servo and Daala. Not to mention fantastic tools such as http://rr-project.org/.

I believe your assessment of Mozilla's engineering talent is inaccurate.

On the other hand, do you have experience with Android tooling or its APIs?

> Well, for really ambitious software projects, you really need someone who has tonnes of experience and can write really good code.

Perhaps more important is permission to explore and invent and follow through.

> I don't see any parallel at Mozilla who could rival them.

Are you serious? Patrick Walton, Alon Zakai just to name a couple.